harrastusaiheisissa

Harrastusaiheisissa is a Finnish adjective form meaning "hobby-themed" or "related to hobbies." It is the inessive plural form of harrastusaiheinen, formed from harrastus (hobby, pastime) and aiheinen (theme-related). When describing plural nouns in the inessive case, the form becomes harrastusaiheisissa, as in examples like harrastusaiheisissa ohjelmissa (in hobby-themed programs) or harrastusaiheisissa julkaisuissa (in hobby-related publications).

Usage of the term is common in contexts where content is categorized or described by its thematic focus on hobbies. It appears in media annotations, library catalogs, educational materials, and discussions about content labeling. The phrase signals that the subject matter centers on activities people pursue voluntarily for pleasure, rather than on professional or official topics. It can describe a range of formats, including articles, programs, exhibitions, and discussions, where multiple hobbies are featured or discussed.

Related forms include harrastusaiheinen (singular, meaning "hobby-themed") and harrastusaiheiset (nominative plural). The term should be distinguished from more general phrases such as harrastuksiin liittyvä (related to hobbies). In typical usage, harrastusaiheisissa emphasizes a thematic grouping around hobbies and is most naturally applied to plural, inessive contexts, e.g., "harrastusaiheisissa yhteyksissä" (in hobby-themed contexts).